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| # 21560 Bearing only included with 20 / 22 gears |

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| # 11210 Mercruiser 1 or Alpha One upper gear set V 8 20/22 Ratio 1.5 1970 thru 1997 |
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- # 11220 Mercruiser Alpha One 24 / 24 gear set for gear
ratio of 1.65 or 1.62 in line 6 cylinder years 1970 thru 1997 with serial number 6225577 thru
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| Mercruiser gears 24/24 ratio 1.65 |

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| #11220 Upper gear set 1970 thru 1997 24/24 in line 6 cylinder |
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| Aftermarket 17/19 ratio 1.84 Alpha One gears |

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| #11230 Alpha One gear set 1970 thru 1997 V-6 and 470 / 485 |
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- # 11240 Alpha one 20 / 24 gear set for ratio of 1.98 or 1.94 in
line 4 cylinder. Mercruiser stern drive years 1983 thru 1990 with serial number 6225577 thru.
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| 1983 thru 1990 OEM 43-55778A3 |

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| # 11240 Mercruiser Alpha one 20/24 gear set for ratio of 1.98 or 1.94 in line 4 cylinder. |
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- # 21511 1972 thru 1990 upper cover bearing assembly O.D. of bearing is 1-25/32" ( 1.781 ) OEM #
31-32575A1 timken cone # LM11949 Outside Race LM11910
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| 1972 thru 1995 upper cover bearing 1-25/32 |

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| # 21511 1972 thru 1990 upper cover bearing assembly O.D. of bearing is 1-25/32 |
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- # 21510 1972 thru 1995 upper cover bearing assembly O.D. of bearing is 1-15/16" ( 1.937 )
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| 1972 thru 1995 upper cover bearing 1-15/16" |

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| # 21510 1972 thru 1995 upper cover bearing 1-15/16" |
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- # 21520 Yoke shaft bearing for all mercruiser gear
ratio except 1.32 OEM # 31-35988A2 six piece set
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| 1972 thru 1995 Roller bearing set |

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| # 21520 All Mercruiser gear ratio except 1.32 6 piece set |
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- # 21560 Pinion gear ratio of 1.50 bearing
race and cone
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| OEM Alpha One bearing parts 1.50 gear ratio |

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| # 21560 Pinion gear ratio of 1.50 bearing race and cone |
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- # 21540 Pinion bearing for gear ratio of 1.65, 1.84 and 1.98 bearing race
and cone
If more service help is required, contact tech service for help troubleshooting your stern drive
at (416) 751-7326
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| OEM Alpha One 1.65, 1.84 and 1.98 gear ratio |

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| # 21540 Pinion bearing for gear ratio of 1.65, 1.84 and 1.98 |
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